Spiny Australian mammal (7)
I believe the answer is:
echidna
'spiny australian mammal' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for echidna that I've seen before include "Prickly creature" , "Spiny Aus. mammal" , "Oz native" , "Such a beast" , "Insectivorous mammal" .)